Chocolate Orange Marble Cake

Ingredients

• Cake
• 1/2 cups Butter
• 1-1/2 cup Sugar
• 1-1/2 Tablespoon Fresh Grated Orange Rind
• 2 whole Eggs
• 2-1/2 cups All-purpose Flour
• 2-1/4 teaspoons Baking Soda, Divided
• 1 cup Buttermilk
• 1 ounce, weight Bittersweet Chocolate, Melted
• 2 Tablespoons Water
• 15 ounces, weight Canned Mandarin Oranges, drained and finely chopped
• _____
• FROSTING
• 1/2 cups Butter, Softened
• 1 whole Egg Yolk
• 4 cups Powdered Sugar
• 4-1/2 Tablespoons Orange Juice
• 1 Tablespoon Fresh Grated Orange Rind
• _____
• GANACHE
• 7 ounces, weight Bittersweet Chocolate
• 1/2 cups Heavy Cream
• 3 Tablespoons Butter
• 1 Tablespoon Brandy
• 1 teaspoon Vanilla